condensation on glass-covered water well

[petracarter]

I have in my basement a beautiful 30ft deep, stone-lined waterwell which I've made into a feature - with a 35mm thick, walk-on, glass cover and an underwater light. We've also added an airvent with an electric pump to extract excess moisture...
However, despite the extractor pump, and wiping the glass with a diluted vinegar mixture, moisture drops still form on the bottom of the glass plate - obviously because of the difference in temperature between air and cover. These drops cannot 'run off' as the plate is perfectly level. Does anyone have any bright ideas how to stop this condensation?

[davewilliams23]

I have exactly the same problem, although my well doesn't have an air vent. I have tried to allow air circulation by creating a gap between the glass well top and the frame, however this was un-succesful. Wondering if you found a solution or a product on the market which would repel water from the glass? (in a form of a coating on the glass?) Awaiting your reply, Thanks.

[Perry525]

Condensation forms on a cold surface.
The glass is too cold.
Raise its temperature and the problem will go away.
Find a small fan heater, like they sell for clearing a cars windscreen and aim it to blow across the glass to warm it.
Note: Condensation forms when warm wet air meets a cold surface. The drop in air temperature reduces the airs ability to hold water vapour. It drops out onto the nearest cold surface.